fix: remove repeated default ports from a URL host in linear time

[fredbi]

removeDefaultPort stripped one ":80" (or ":443") at a time and re-parsed the whole remaining host after each strip. With lenient colon parsing (Go 1.25, or GODEBUG urlstrictcolons=0 since Go 1.26), url.Parse accepts a host such as ":80:80:...:80", so a single $ref of a few hundred KB kept jsonreference.New busy for tens of seconds: the cost was quadratic in the length of the host.

The trailing repetitions are now counted in one scan and stripped at once. The shortened host is parsed at most twice: if it no longer parses, a single repetition stays, which is where the one-by-one removal stopped. Every shortened host but the last still ends with the default port, which url.Parse already accepted on the original host, so the result is the same as before and normalizing stays idempotent.

With the default strict colon parsing of Go 1.26 such hosts are rejected by url.Parse before normalization, so v1.0.2 and later are only exposed when an application opts out with urlstrictcolons=0. v1.0.1 (go 1.25.0) is exposed by default when built with Go 1.25.

FuzzRemoveDefaultPort checks the new implementation against the former one, and TestRemoveDefaultPortLinear pins the cost on 100 000 repetitions.

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.07%. Comparing base (1461e75) to head (85b93ab).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   97.97%   99.07%   +1.09%     
==========================================
  Files           2        2              
  Lines          99      108       +9     
==========================================
+ Hits           97      107      +10     
+ Misses          2        1       -1     

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